OBD-II Code P2229 — What It Means & How to Fix It

What it means

The barometric pressure sensor is reading a voltage that is too high — the opposite of P2228.
A high signal usually means an open circuit or a short to power in the sensor wiring.
The engine computer relies on this sensor to calculate the correct air/fuel ratio, so a faulty reading can cause lean conditions and misfires.

Affected Models

All vehicles 1996+
Common in General Motors vehicles
Common in Ford vehicles
Common in Dodge/Ram vehicles
Common in vehicles driven at high altitude

Common Causes

Open circuit in the BARO sensor signal wire
Short to power in the sensor wiring harness
Defective barometric pressure sensor stuck at maximum output
Poor sensor ground connection
Water or debris inside the sensor connector

How to Fix It

Use an OBD-II scanner to confirm P2229 and check for related MAP codes.

MAP sensor codes appearing together with P2229 suggest a shared wiring or ground fault.
Inspect the sensor connector and harness for open wires or shorts.

An open circuit lets voltage float high — look carefully for broken wires near flex points or heat sources.
Verify proper ground at the sensor connector with a multimeter.

A missing ground forces the signal wire voltage high, mimicking an open circuit fault.
Measure sensor reference voltage — should be near 5V from the ECM.

If reference voltage is correct but signal is too high, the sensor itself is defective.
Replace the barometric pressure sensor if wiring is confirmed good.

After replacement, clear the code and drive through varied conditions to confirm normal BARO readings.

When to Call a Professional

If wiring inspection and connector repair don't resolve the code, have a mechanic test the reference voltage and signal circuits.
Diagnosis involves verifying the 5V reference from the ECM and tracing any open or shorted wires.
Expect to pay $80–$130 for diagnosis; the sensor itself is typically $30–$100 to replace.

Frequently Asked Questions

Will P2229 cause my car to stall?

Not typically, but a lean fuel condition from incorrect BARO readings can cause hesitation.
In severe cases, it may cause hard starting in extreme temperatures.

How do I know if it's the sensor or the wiring?

Test the signal wire for continuity from the sensor to the ECM.
If the wire is fine, the sensor itself is likely bad.

What does 'short to power' mean?

It means a wire that should carry a small signal is accidentally touching a power wire.
This forces the voltage reading higher than it should be.